首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
对放置一段时间后的生石灰样品进行实验． ①取少量样品放入水中，有较多热量放出，滴加酚酞后呈 色． ②另取少量样品，进行实验： Ⅱ中氢氧化钠与稀盐酸反应的化学方程式是 ． Ⅲ是将CO...
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
实验室很多化学药品长期放置会变质氢氧化钠放置一段时间后有一部分变成碳酸钠取部分已变质的氢氧化钠固体样
下列现象不能用质量守恒定律解释的是
蜡烛燃烧后质量减小
饱和食盐水敞口放置一段时间后质量减小
镁条燃烧，生成物的质量比镁条的质量大
生石灰在空气中放置一段时间后质量增大
下列物质在空气中敞口放置一段时间后因发生化学变化而使质量增加的是
浓盐酸
浓硫酸
氯化钠
生石灰
新采摘的玉米果穗具有甜味但放置一段时间后甜味便降低如果采摘后放在沸水中浸泡一段时间后再保存甜味要保留
放置一段时间后甜味降低的原因是玉米进行呼吸作用消耗了部分单糖
沸水浸泡后甜味可保留较长时间，因为高温使分解甜味物质的酶失活
该实验说明酶的催化作用受温度影响
新采摘的玉米果穗放入冰箱低温储藏不能延长甜味保留的时间
小海探究氢氧化钠固体溶于水时其温度的变化后由于疏忽未将盛氢氧化钠固体试剂的瓶塞塞紧一段时间后它可能变
下列物质放置在空气中一段时间后质量有变化但和空气成分无关的是
浓盐酸
浓硫酸
氢氧化钠
生石灰
下列对露置在空气中已部分变质的氢氧化钠溶液样品进行的相关实验中实验现象及结论合理的是
取少量溶液样品，滴入硫酸铜溶液，无明显现象
取一定量溶液样品，滴入稀盐酸，立即有大量气体产生
取一定量溶液样品，滴入适量的澄清石灰水，过滤，向滤液中滴加酚酞溶液，溶液变红，证明原样品中含有氢氧化钠
向溶液样品中加入适量的澄清石灰水至恰好完全反应，过滤，可除去样品中的杂质
工业上生产的生石灰里常混有少量碳酸钙不含其它杂质为测定生石灰中氧化钙的纯度取50g样品在高温条件下完
4.4％
10.0％
90.0％
95.6％
亚硫酸盐的一些性质和碳酸盐的性质类似如Na2SO3亚硫酸钠溶液呈碱性BaSO3亚硫酸钡是白色难溶于水
下列药品敞口放置在空气中一段时间后质量都会增加其中是因物理变化而导致质量增加的是
生石灰
固体烧碱
浓硫酸
澄清石灰水
生石灰常用作食品干燥剂.久置的生石灰中可能会含有氧化钙氢氧化钙碳酸钙三种物质中的一种或几种假设久置的
将浓盐酸在空气中敞口放置一段时间后其质量会将浓硫酸在空气中敞口放置一段时间其溶质质量分数会将生石灰在
按照建筑材料放射性核素限量GB6566—2001及相关要求测量土壤样品前应将样品破碎磨细将其放入样品
1～2周
2～3周
3～4周
4～5周
亚硫酸盐的一些性质和碳酸盐的性质类似如Na2SO3亚硫酸钠溶液呈碱性BaSO3亚硫酸钡是白色难溶于水
下列对露置在空气中已部分变质的氢氧化钠溶液样品进行的相关实验中实验现象及结论合理的是
取少量溶液样品，滴入氯化钡溶液，有白色沉淀生成
取一定量溶液样品，滴入稀盐酸，立即有大量气体产生
取一定量溶液样品，滴入适量的澄清石灰水，过滤，向滤液中滴加酚酞溶液，溶液变红，证明原样品中含有氢氧化钠
向溶液样品中加入适量的澄清石灰水至恰好完全反应，过滤，可除去样品中的杂质
将上的条码部分伸开压平一段时间再将其固定在一块全黑硬质材料板上其样品从室外拿到检验室后应放置0.5～
铜版纸
不干胶标签中
塑料包装
马口铁
同学们来到了揭秘生石灰展台进行实验将鹌鹑蛋埋入生石灰中之后加入水一段时间后发现鹌鹑蛋变熟了该过程中发
亚硫酸盐的一些性质和碳酸盐的性质类似如Na2SO3亚硫酸钠溶液呈碱性BaSO3亚硫酸钡是白色难溶于水
某兴趣小组的同学对一包在空气中敞口放置一段时间的碱石灰产生了好奇于是他们对这包碱石灰的成分展开了探究
检验生石灰中是否含有未烧透的石灰石最简便的方法是
看白色粉末中是否有块状固体
取少量样品加入少量水中看是否有不溶物
取少量样品加入少量盐酸中看是否有气泡
取少量样品在试管中加热看是否有气泡
热门试题
更多
在△ABC中内角ABC所对的边分别为abc．已知△ABC的面积为3b﹣c＝2cosA＝﹣则a的值为．
某种产品的广告费支出x与销售额y单位万元之间有下表关系y与x的线性回归方程为当广告支出5万元时随机误差的效应残差为
用数字12346组成没有重复数字的五位数其中偶数的个数为
过双曲线＝1a＞0b＞0的一个焦点作实轴的垂线交双曲线于AB两点若线段AB的长度恰等于焦距则双曲线的离心率为
i是虚数单位＝
在工商管理学中MRP指的是物质需要计划基本MRP的体系结构如图所示．从图中能看出影响基本MRP的主要因素有个．
Bytheendoftheyeara3D﹣printedbridgewillbeputtouseinChinaforthefirsttime. Different1traditionalbridgesits2createdesigndoesn'tusereinforcedconcrete.Itismadeofanewmaterial3designtoweatherrainandsunfor4extendedperiodandthat'sdurableenoughtomeetnationalconstructionindustrystandards.Ifpartsofthebridgebecomedamagedtheycanberepaired5separate. The15﹣meter﹣longfootbridgeinShanghai6willhaveservicelifeofupto30yearswilltake35daystobuildaccordingto7itchiefarchitect.Thecomplexcurvedsurfacesofthebridgecanonlybeachievedby8use3Dprintingtechnology.Basedonlaboratorytestingitcanbearaloadof250kilogramspersquaremeter. Thisisn'tthefirsttimethata3D﹣printedbridge9makeinChina.InJulylastyearTongjiUniversityinShanghaimadetheworld'sfirsttwo3D﹣printedpedestrianbridges. 10thatpairofbridgeswasonlybuiltasademonstrationandnotforactualuse.
如图已知多面体PABCDE的底面ABCD是边长为2的菱形PA⊥底面ABCDED∥PA且PA＝2ED＝2． 1证明平面PAC⊥平面PCE 2若直线PC与平面ABCD所成的角为45°求二面角P﹣CE﹣D的余弦值．
Thewordtoleranceiswidelyusedinliberaldemocracies自由民主.Itindicatesapositivemeaning.Politiciansurgeustobetoleranttowardsminorities.Educatorsteachustobetoleranttowardstheother.Thepressisfullofreferencestotheneedtodisplaytolerancewhenfacedwithindividualsorgroupsespousingadifferentvieworholdingadifferentreligiousbelief.Atolerantsocietyisanobjectivesoughtafterbyanyonewhobelievesinthevaluesofdemocracy.Atolerantindividualisconnectedwithvirtuousqualities. Thequestionwemustaskiswhetherwehavebeenusingthewordtolerancefullyawareofitsmeaningandwhetherwehaveapplieditcorrectlytoreflectwhatwereallywishtoconvey. Thewordtolerancemeanstobearortobearwith.IfItoleratesomethingorsomeoneIbasicallysaythatIamreadytobearitorhim.Icantolerateabadsmelloranoisyneighbour.TheactoftolerationforcesmetodesistfromconveyingmyobjectiontotheexistenceofaphenomenonwhichIfinddifficulttobear.Abadsmelloranoisyneighbourisconsideredbymetobeanobjectionablephenomenon.BytoleratingeitherofthemIamnottransformingthebadsmellorthenoisyneighbourintopositivephenomena.Let'sbehonest:Idon'thaveadifferenttastewhenitcomestobadsmells.Isimplydislikeitandhopethatitdisappears.Idon'trespectthenoisyneighbour.IwouldratherhavehimstopatoncethenoiseheismakingsoIcanliveinpeace. Thesubjecttoleratingisbynaturenotequaltotheobjectbeingtolerated.IfItolerateyouIessentiallysaythatIamaboveyouandampreparedalthoughunwillinglytobearwithyourpresenceorwithyourpracticesoropinions.Thatmaybetrueinthecaseofanindividualwhoisreadytotoleratetheother.Howeverthisattitudebysuchanindividualthoughempiricallytrueishardlyavirtue.Certainlythefactthatanindividualinrealitymaymerelytoleratetheotherorhisopiniondoesnotjustifyagovernmentoranyofficialauthoritypromotingtoleranceasavirtue.Onecannottolerateanequalbeing.Trueequalityinvolvesrespectnottoleration.Torespecttheotherasadistinctivepersonishardlytotoleratehim.Thisisthetruemeaningofequality:diversityexistinginamutually﹣respectfulsocio﹣legalsetting. Atolerantattitudeinvolvesthegrantofafavournotaright.Thequestionweshouldaskourselvesiswhetherwewouldeverwishaparliamenttomakelawsconsideringusasindividualsandaspartofacollectiveentityorapermissiontopursuecertainactionsinterpretedasafavourratherthanaright?Indeedwouldweeverwishanyonetolistentoourviewsandacceptusthewaywearesimplybecauseheiskindenoughtotolerateus? 1Thefirsttwoparagraphsaremainlyintendedtoshowthat. A.toleranceisasymbolofliberaldemocracies B.democraticsocietyalwaysadvocatestolerance C.people'sunderstandingoftoleranceisone﹣sided D.tolerancecanbeappliedtomanysituations 2Theexampleofabadsmellandanoisyneighbourisraisedtoindicatethat. A.thewriterarefedupwiththem B.mostpeoplefindthemhardtotolerate C.thewriterisn'tprejudicedagainstthem D.toleratingthemisn'tavirtuousact 3ThemainideaofParagraph4isthat. A.toleranceshowsanunequalrelationship B.mostpeoplepromotetoleranceasavirtue C.peopleshouldshowrespectforeachother D.tolerancehasnothingtodowithrespect 4Whichcanbethebesttitleforthispassage? A.ToleranceandRespect B.WhatIstoBeTolerated? C.IsToleranceaVirtue? D.ShouldPeopleBeTolerant?
InthewintermonthsthetemperatureinmostofCanadausuallystaysbelow0℃.HoweverinsomepartsofCanadasuchassouthernBritishColumbiathetemperaturerarelygoesbelow0℃.Inmostareaswherepeoplelivesnowwillbeonthegroundfrommid﹣Decembertomid﹣March.ThoughCanada'swintermaybemuchcolderandlongerthanyouareusedtoitcanbeveryenjoyable.FormanyCanadiansbeingactiveinwinterisanimportantpartofenjoyinglife.Therearemanyoutdoorwinteractivitiesincludingskiingicefishingwalkingandskating.Joininginoneoftheseactivitiesmayhelpyouappreciatewinterandenjoyyourtimeoutsideinthesnow. Dressingforwinter DuringwinterinCanadayouwillneedwarmclothing.Ifpossiblearrivewiththeseitemsorbepreparedtobuythemsoonafteryourarrival.Youwillneed: ☆warmwaterproofboots☆ascarfforyourneck ☆ahatthatcoversyourears☆glovesforyourhands ☆thickwintercoatspantsandsweaters Layerskeepyouwarm It'sagoodideatolayeryourclothingbyforexamplewearingaT﹣shirtandasweaterunderneathajacket.Ifyoubecometoohotit'salwayseasiertoremoveapieceofclothingthantoaddanother.OntheWestCoastpreparetodressforcoolrainyorsnowyweather.Youwillneed: ☆awarmwaterproofcoat☆waterproofhats ☆anumbrella☆rainbootsorsnowboots LearnmoreaboutweatherandseasonsacrossCanada.YoucanalsocontactRelatedLinksforexampleanimmigrant﹣servingorganizationinthecommunitywhereyouliveformoreinformationaboutdressingforwinter. 1Whatisthemainpurposeofthefirstparagraph? A.TotellaboutthedetailsaboutCanada. B.Toshowmanyoutdoorwinteractivities. C.TointroducethedailylifeofCanadians. D.ToencourageyoutoenjoywinterinCanada. 2IfyouspendawinterinCanadayou'llpreparethefollowingEXCEPT. A.anumbrellaandsunglasses B.thickwintercoatsandpants C.waterproofhatsandcoats D.snowbootsandgloves 3Inwhichpartofanewspapercanyoufindthispassage? A.Business. B.Sports. C.Tourism. D.Health.
若点P为抛物线Cy＝2x2上的动点F为C的焦点则|PF|的最小值为
WhenIwasafreshmanincollegeIreceivedaletterthatforeveropenedawindowinmysoul.Ihadjuststartedwritingandthe1ofmylocalcountynewspaperhadbeenkindenoughto2someofmywork.Aboutamonthlaterthe3arrived. Hereiswhatitsaid.Youmaynot4me.Welastsaweachotherinkindergartenandmy5movedthenextyear.We6getthecountypaperinthemailthoughandwhenIsawyournameIhadtowriteyou.Youseethatfirstyearinschoolwasvery7forme.Iwasatiny8andordinary﹣lookinggirlthattheotherchildren9meeveryday.ThethingIrememberaboutyouisthatyou10did.Whenwe11togoouttheteacheralwaysputmebesideyouandyouwouldholdmyhandaswe12thestreet.Youtalkedtomeandplayedwithme.You13measapersonnotsomeonedifferentandIwillbeforever14forthat.Mywholelifewas15becauseofhowyoutreatedmeallthoseyearsago. Icarefullywrotebacktomykindergartenfriendandwe16forseveralyears17theillnessthatshehad18withsincechildhoodfinallytookherlife.IwillneverforgethoweverjusthowmuchthatsimplekindnessIhadshared19toher. Everyactofkindnesswedo20another'sheart.Everybitofgoodnesswesharemakestheworldabetterplace.Let'susethatpowerandmakebothEarthandHeavensmile. 1A.teacher B.director C.editor D.leader 2A.print B.publish C.report D.check 3A.newspaper B.message C.work D.letter 4A.remember B.recognize C.hear D.forget 5A.parents B.family C.school D.classmates 6A.still B.also C.just D.even 7A.busy B.happy C.difficult D.easy 8A.honest B.naughty C.sunny D.sick 9A.kidded B.helped C.hated D.beat 10A.occasionally B.never C.seldom D.always 11A.gotup B.linedup C.endedup D.cheeredup 12A.adventured B.visited C.cleaned D.crossed 13A.judged B.heard C.knew D.saw 14A.grateful B.hopeful C.regretful D.skillful 15A.harder B.better C.easier D.healthier 16A.cooperated B.corresponded C.lived D.worked 17A.after B.when C.before D.while 18A.experienced B.studied C.treated D.struggled 19A.meant B.done C.appeared D.got 20A.discovers B.obtains C.enriches D.touches
甲乙丙三位同学被问到是否看过ABC三本书时甲说我看过的比乙多但没看过C书乙说我没看过B书丙说我们三人看过同一本书．由此可判断乙看过的书为
BroadBand:byClaireL.Evans.Portfolio2018﹩27 Thoughoftenoutnumberedbymenwomenstayedintheboomingfieldofcomputing.InthisinspiringtalewriterEvansrecordsthecontributionsofsomeofthemanywomenwhoaidedtheriseofthemodernInternet. MemorablecharactersincludeElizabethJakeFeinleraninformationscientistwhohelpedresearchersnavigatetheArpaneandStacyHornwhostartedoneofthefirstsocialnetworksEcho. TheWizardandtheProphet:byCharlesC.Mann.Knopf2018﹩28.95 Thehumanpopulationismovingtoward10billion﹣﹣﹣someexpertsthinkwe'llnearlyhitthatmarkby2050.Howwilltheearthfeedhouseandotherwisesupportsuchacrowd?Environmentalthinkersusuallyfallintooneoftwocamps:thosewhopreferconservationandcontrollingconsumptionlikeWilliamVogtandthosewhotrustinnovationtosolveourproblemsNormanBorlaugforexample.WriterManncarefullyrecordsthelivesandthoughtofthefoundersofthesetwophilosophies. ALabofOne'sOwn:byPatriciaFara.OxfordUniversityPtess2018﹩24.95 InWorldWarImanywomenintheU.K.replacedtheirapronswithchemicalsuitsandsteppedintopreviouslymale﹣onlyfieldsofsciencewheretheyledwarresearchefforts.SciencehistorianFaraillustratesthelivesofmanyoftheseforgottenwomen.Althoughtheeramarkedamajorstepforwardforwomenscientistsmanyworkedforsmallwagesinanenvironmentofdiscrimination. Inthenearly100yearssincewomenhavecomealongwayFarawritesbuttheglassceilingsremainsolidandthepipelinesleaky. AtomLand:byJonButterworth.TheExperiment2018﹩19.95 Butterworthtakesreadersonanamusingjourneythroughtheunknownworldofparticle粒子physics.ThefirststopisAtomLandwhereButterworthexplainshowelectronsprotonsandneutronscometogethertobuildupeverythingweknow.Asthejourneyunfoldswelearnaboutlesser﹣knownparticles.Thankfullyourshipisequippedwithtoolssuchasmathematicalequations方程式andalaserlightthatlightsupthedarkestofconcepts. 1Whofocusesonthefutureofourearth? A.ClaireL.Evans. B.CharlesC.Mann. C.PatriciaFara. D.JonButterworth. 2Whichbookswillyouprobablyreadifyouareinterestedinwomen'scareer? A.BroadBand&AtomLand. B.TheWizardandtheProphet&AtomLand. C.BroadBand&ALabofOne'sOwn. D.ALabofOne'sOwn&AtomLand. 3What'sthepurposeofwritingthepassagesabove? A.Toclarifysomeconcepts. B.Tointroducesomefamouswriters. C.Tomakecommentsonsomebooks. D.Torecommendsomebooks.
Asnowstormhitmyneighborhoodtheotherday.Ihadrecentlyagreedtobethehouse'sgroundskeeperwhichmeantIgot1withshoveling铲theinchesofsnowthatcoveredthedriveway. Ihadstayedinthehouseduringthe2soIwasactuallyprettyhappytohead3.IshoveledforanhourorsoandIfeltmusclesinmyarmsandlegsthatIhad4usedstarttoburn.BythetimeIfinishedshovelingIwasgettingthe5Inormallygetfrombiking.TobehonestIwaspretty6tostop. AfewdayslatersomefriendsandIgotintoa7abouthowharditistoexercise.Goingtogymsisbecomingthemostannoying8ever.Notexercisinghasaneffectonourhealth.Lessthan5%ofadultsarephysically9forhalfanhouraday.Notexercisingenoughcan10diseaseslikeheartdiseasescancerobesityanddepression. Andyetshovelingsnowwasthat11.Itdidn'ttaketoomuch12becauseIwasn'tshovelingforexercisebutto13thedriveway.Peoplepaymuchmoneyforgymmembershipsandclassesto14extrafat.Sowhynot15payingthefitnessindustrytoexerciseandhelpwitheachotherwithsuchkindof16?Surelythey'rebetteroff17thatmoneyandputtingtheenergytopracticaluse. AneighborhoodcouldhaveaFacebookgroupwherepeoplecould18thingstheyneededhelpwith.Thenpeoplewhowantedtoexercisecould19.Win﹣win.Insteadofmakingitabouthelpingpeopleitcanbeframedasanewfitness20. 1A.charged B.filled C.tasked D.crowded 2A.festival B.disaster C.rush D.storm 3A.outside B.inside C.forward D.backward 4A.usually B.directly C.really D.rarely 5A.challenge B.exercise C.threat D.power 6A.lucky B.angry C.happy D.sorry 7A.party B.meeting C.discussion D.fight 8A.homework B.routine C.solution D.business 9A.strong B.healthy C.active D.sleepy 10A.bringabout B.setoff C.takedown D.livethrough 11A.difficult B.easy C.valuable D.perfect 12A.determination B.intelligence C.reputation D.confidence 13A.design B.clear C.build D.wash 14A.puton B.passdown C.pickup D.burnoff 15A.enjoy B.miss C.stop D.escape 16A.reality B.labor C.dream D.faith 17A.saving B.collecting C.donating D.achieving 18A.seek B.imagine C.post D.examine 19A.helpout B.showoff C.turnaround D.runaway 20A.lesson B.skill C.map D.style
德国数学家科拉茨1937年提出了一个著名的猜想任给一个正整数n如果n是偶数就将它减半即如果n是奇数则将它乘3加1即3n+1不断重复这样的运算经过有限步后一定可以得到1．对于科拉茨猜想目前谁也不能证明也不能否定现在请你研究如果对正整数n首项按照上述规则施行变换后的第8项为1注1可以多次出现则n的所有不同值的个数为
已知F为双曲线Ca＞0b＞0的左焦点直线l经过点F若点Aa0B0b关于直线l对称则双曲线C的离心率为
设1﹣im＝1+ni其中mn是实数则|m﹣ni|＝．
若xy满足约束条件目标函数z＝ax+y取得最大值时的最优解仅为13则a的取值范围为
假设你是李华得知你的英国好友Tom通过了来华支教的申请将于今年七月到边远地区教学.请根据下面的提示给他写封电子邮件: 1.表示祝贺; 2.分析可能遇到的挑战; 3.告知提前了解当地的风俗习惯. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯.
文中共有10处语言错误每句中最多有两处每处错误涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. MyfriendLillyandIwereonthewaybacktohomefromschoolwhenwesawaboyfalloffhisbicycles.Theboylayonthegroundscreamedinpain.Werushedtohelpandfoundiftheboy'sleftlegwasbleeding.Ithappenedthatwehavelearnedsomeknowledgeaboutfirstaidbeforesoweknewhowweshoulddo.Wedialed120andcalledanambulance.WhilewaitingitItookoutmyhandkerchiefandpressedthemontothebleedingpoint.Thenwerolledtheboyontoonesidebutputhimintherecoveryposition.Westayedwithhimuntiltheambulancearrived5minuteslate.
在等比数列{an}与等差数列{bn}中a1＝1b1＝﹣2a2+b2＝﹣3a3+b3＝﹣4． 1求数列{an}与数列{bn}的通项公式 2若cn＝an+bn求数列{cn}的前n项和Sn．
AprojectinGambiaisempoweringwomenandreducingdangerouswasteatthesametime. TheWasteInnovationCenterfundedbytheEuropeanUnion'sGlobalClimateChangeAllianceshowswomenintheBrikamaareahowtorecyclewasteintousefulmaterialsandproductswhichtheycanthensellinlocalmarkets. Wood﹣likewasteisrecycledintocharcoal木炭forexamplewhichcanbeusedtosupersedefirewoodandreducethenumberoftreesthatarecutdownforfirewood.Foodwasteisrecycledintocompost混合肥料tofunctionasenvironmentallyfriendlyfertilizersandplasticisturnedintomanyusefulthings. SupportedbyWasteAidUKandtheGambiaWomen'sInitiativeGWIamongotherstheprojectprovideswomenwithskillstheycanusetobecomeself﹣sufficient自给自足的.Womenlearningatthecentercomefromfivecommunitiesandsomeofthemtravelasfaras12milestolearntheseimportantskillsthatwillprovidethemwithanincomeaccordingtoTheGuardian. IsatouCeesaywhonowleadstheGWIhighlightedtheneedtofocusoneconomicequalityinhercountrytellingTheGuardianIntermsofeducationwomenaretheoneswhoarealwaysbehind.Boysarechosentogotoschool.Whenweconductourtrainingwefindwomencandoalotbutdon'tknowwhotheyareorhowtoimplement实施things. AccordingtotheWorldHealthOrganization'sCountryCooperationStrategy2008﹣2013reportthemainenvironmentalissuefacingGambiaispoorwastemanagementinurbanareas. NdeySirengBakurinexecutivedirectoroftheNationalEnvironmentAgencyhasvoicedconcernoverhealthandenvironmentalriskssuchaswaterpollutiontheincreaseofinsectsaswellasfloodingthatoccurasaresultofpoorwastemanagement. 1WhatdoestheWasteInnovationCentertrytodo? A.DeveloplocalmarketsinBrikama. B.Teachwomenhowtoinventnewthings. C.Keepwomenawayfromdangerouswaste. D.HelpwomeninBrikamabenefitfromwaste. 2WhatdoestheunderlinedwordsupersedeinParagraph2probablymean? A.Replace. B.Transform. C.Burn. D.Reserve. 3FromwhatIsatouCeesaysaidwecanlearnthatwomeninGambia. A.don'tlearnnewthingsfast B.aren'tinterestedineducation C.reallyhopeforeconomicequality D.arenotfairlytreatedinthecountry 4Whatisthewriter'spurposeofwritingthelastparagraph? A.Tosummarizethepreviousparagraphs. B.Toprovidesomeadviceforthereaders. C.Toaddsomebackgroundinformation. D.Tointroduceanewtopicfordiscussion.
国家放开计划生育政策鼓励一对夫妇生育2个孩子．在某地区的100000对已经生育了一胎夫妇中进行大数据统计得有100对第一胎生育的是双胞胎或多胞胎其余的均为单胞胎．在这99900对恰好生育一孩的夫妇中男方女方都愿意生育二孩的有50000对男方愿意生育二孩女方不愿意生育二孩的有x1对男方不愿意生育二孩女方愿意生育二孩的有x2对其余情形有x3对且x1x2x3＝30010099．现用样本的频率来估计总体的概率． 1说明“其余情形”指何种具体情形并求出x1x2x3的值 2该地区为进一步鼓励生育二孩实行贴补政策凡第一胎生育了一孩的夫妇一次性贴补5000元第一胎生育了双胞胎或多胞胎的夫妇只有一次性贴补15000元．第一胎已经生育了一孩再生育了二孩的夫妇一次性再贴补20000元．这种补贴政策直接提高了夫妇生育二孩的积极性原先男方或女方中只有一方愿意生育二孩的夫妇现在都愿意生育二孩但原先男方女方都不愿意生育二孩的夫妇仍然不愿意生育二孩．设ξ为该地区的一对夫妇享受的生育贴补求Eξ．
Doyoulikewritingafewparagraphseverydayaboutyourexperienceshopesmemoriesorfeelings?Ifyoudon'tit'stimetomakeachangenow.Writejustafewparagraphseverydayaboutyourexperienceshopesmemoriesandfeelingsandyouwillimmediatelybegintoexperiencebenefitstoyourpersonalgrowthandpotential. Youwillgraduallybecomebetteratexpressingyourself.1Howeverwhenyoubecomelazywithwordsyoufinditismoredifficulttodescribefeelingsshareexperiencesandmakeyourselfunderstood. 2Asyouwriteaboutmemoriesitislikeopeninganoldphotoalbum.Yourpenbeginstoexplorefeelingsanddetailsyouhaveforgottenanddreamsyouhaveleftbehind.Yousuddenlyrememberpeopleyouwouldliketocontactagain.Writingisanactivitythatavoidsdistraction使人分心的事longenoughforyoutoexplorethosewonderfulmomentsofthepast.Sometimestheyarefrightening3 Writingaboutdailyexperiencesandfeelingsprovidesarecordedhistorythatwillinfluencehowyoumakefuturedecisions4Theylearnedfromwhathadhappenedbefore.Yourhistoryisimportant.Don'tletitbeforgotten. Writingremindsyouofyourdreamsandkeepsyoumovingtowardthem.Itisameansofkeepingtrackofyourpurposeandthegoalsthatwillleadyoutoachievethem.5Itshowswhenyouhavebeendistractedandmayneedtogiveallyourattentionagaintoyourwriting. Writingalittleeverydaycouldprovidethematerialthatsomedaybecomesapublishedbook.WhenIwroteaboutmydepressionandmyfour﹣year﹣oldgranddaughterwhogotlostinthemountainsIneverdreameditwouldbeinabook. A.Youwillrememberthingslongforgotten. B.Writingkeepsyouenergeticandfullofimaginationallthetime. C.Sometimestheyarewonderfulandalmostalwaystheyarehelpful. D.Soonerorlateryouaresurelytobecomeagreatprofessionalwriter. E.Reviewingwhatyouhavewrittenisaperfectwaytoseeyourprogress. F.There'sareasonthatthegreatestleadersinhistorywerestudentsofhistory. G.Whenyouwritedailyyoucanalwaysbeamazedathowquicklyyourwritingskillsimprove.
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. RecentlywehavehadainstructivediscussiononhowtomakeEnglishlearningrelaxingandinteresting.It'salltoonaturalthatwehadcomeupwithalotofadvicesconcerningthetopic.FirstlywecanhavemoreinteractiveactivitiesthatmakesEnglishlearninggreatfuninclassanditisgenerallyconsiderednotalittlebeneficiallytousall.SecondlyweneedtofindmorechancestocommunicatingwithpeopleinEnglishwhethertheyareEnglishteachersandclassmatesbecauseusingEnglishisthebestwaytolearn.Asitisknowntoallpracticemakesperfect. InmyeyestherearemanyotherwayslikelisteningEnglishsongswatchingEnglishmoviesjoiningEnglishclubsormakingpenfriendsontheInternet.Thatweneedmostismoretimeandmorespace.
i是虚数单位＝
假设东莞市市民使用移动支付的概率都为p且每位市民使用支付方式都相互独立的已知X是其中10位市民使用移动支付的人数且EX＝6则p的值为
设1﹣im＝1+ni其中mn是实数则|m﹣ni|＝．
设0＜p＜1随机变量ξ的分布列是 则当p在01内增大时
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
湘公网安备 43130202000226号